<template>
  <div 
    :class="className" 
    :style="{height:height,width:width}"/>
</template>

<script>
import echarts from 'echarts';
require('echarts/theme/macarons'); // echarts theme
import { debounce } from '@/utils';

export default {
    props: {
        className: {
            type: String,
            default: 'chart'
        },
        width: {
            type: String,
            default: '100%'
        },
        height: {
            type: String,
            default: '350px'
        },
        autoResize: {
            type: Boolean,
            default: true
        },
        chartData: {
            type: Object,
            required: true
        }
    },
    data() {
        return {
            chart: null,
            sidebarElm: null
        };
    },
    watch: {
        chartData: {
            deep: true,
            handler(val) {
                this.setOptions(val);
            }
        }
    },
    mounted() {
        this.initChart();
        if (this.autoResize) {
            this.__resizeHandler = debounce(() => {
                if (this.chart) {
                    this.chart.resize();
                }
            }, 100);
            window.addEventListener('resize', this.__resizeHandler);
        }

        // 监听侧边栏的变化
        this.sidebarElm = document.getElementsByClassName('sidebar-container')[0];
        this.sidebarElm && this.sidebarElm.addEventListener('transitionend', this.sidebarResizeHandler);
    },
    beforeDestroy() {
        if (!this.chart) {
            return;
        }
        if (this.autoResize) {
            window.removeEventListener('resize', this.__resizeHandler);
        }

        this.sidebarElm && this.sidebarElm.removeEventListener('transitionend', this.sidebarResizeHandler);

        this.chart.dispose();
        this.chart = null;
    },
    methods: {
        sidebarResizeHandler(e) {
            if (e.propertyName === 'width') {
                this.__resizeHandler();
            }
        },
        setOptions({ expectedData, actualData } = {}) {
            this.chart.setOption({
                xAxis: {
                    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
                    boundaryGap: false,
                    axisTick: {
                        show: false
                    }
                },
                grid: {
                    left: 10,
                    right: 10,
                    bottom: 20,
                    top: 30,
                    containLabel: true
                },
                tooltip: {
                    trigger: 'axis',
                    axisPointer: {
                        type: 'cross'
                    },
                    padding: [5, 10]
                },
                yAxis: {
                    axisTick: {
                        show: false
                    }
                },
                legend: {
                    data: ['expected', 'actual']
                },
                series: [{
                    name: 'expected', itemStyle: {
                        normal: {
                            color: '#FF005A',
                            lineStyle: {
                                color: '#FF005A',
                                width: 2
                            }
                        }
                    },
                    smooth: true,
                    type: 'line',
                    data: expectedData,
                    animationDuration: 2800,
                    animationEasing: 'cubicInOut'
                },
                {
                    name: 'actual',
                    smooth: true,
                    type: 'line',
                    itemStyle: {
                        normal: {
                            color: '#3888fa',
                            lineStyle: {
                                color: '#3888fa',
                                width: 2
                            },
                            areaStyle: {
                                color: '#f3f8ff'
                            }
                        }
                    },
                    data: actualData,
                    animationDuration: 2800,
                    animationEasing: 'quadraticOut'
                }]
            });
        },
        initChart() {
            this.chart = echarts.init(this.$el, 'macarons');
            this.setOptions(this.chartData);
        }
    }
};
</script>
